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Peel Police Constable Fiona Thivierge said shortly before 1 p.m. Tuesday afternoon that they did not believe the other suspect was still in the school but that they were searching to be certain. Almost two hours later, the police Twitter account announced that the lockdown had ended.

According to the website of the school, another nearby facility – St. Jean-Marie Vianney – was in what was described as a “hold & secure.”

St. Roch was built within the last five years, and houses about 1,400 students from Grades 9 to 12.

A spokesman for the Dufferin-Peel Catholic District School Board said police were in the school and he was still waiting for details on what occurred.